Submission #995130

#	Time	Username	Problem	Language	Result	Execution time	Memory
995130		mrwang	Strange Device (APIO19_strange_device)	C++14	100 / 100	320 ms	54056 KiB

strange_device

#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<ll,ll>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e5;
const ll inf=3e18;
const ll mod=1e9+7;
ll n,A,B;
vector<pli>vec;
void solve()
{
    cin >> n >> A >> B;
    ll x=(A/__gcd(A,B+1))*B;
    bool ok=true;
    ll sum=0;
    for(int i=1;i<=n;i++)
    {
        ll l,r;
        cin >> l >> r;
        sum+=r-l+1;
        if((r-l+1)>=x)
        {
            ok=false;
        }
        l%=x;
        r%=x;
        if(l<=r)
        {
            vec.pb({l,r});
        }
        else
        {
            vec.pb({l,x-1});
            vec.pb({0,r});
        }
    }
    ll cc=A/(__gcd(A,B+1));
    if(inf/cc<B)
    {
        cout << sum;
        return;
    }
    if(ok==false)
    {
        cout << x;
        return;
    }
    sort(vec.begin(),vec.end());
    ll s = 0, hi = -1;
    for(int i = 0; i < vec.size(); i++){
        if(vec[i].fi > hi){
            s += (vec[i].se - vec[i].fi + 1);
            hi = vec[i].se;
        }
        else
        {
            s+=max(0ll,vec[i].se-hi);
            hi=max(hi,vec[i].se);
        }
    }
    cout << s << "\n";
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

Compilation message (stderr)

strange_device.cpp: In function 'void solve()':
strange_device.cpp:55:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for(int i = 0; i < vec.size(); i++){
      |                    ~~^~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 30 / 30